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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <p>
      This test requires a gamepad device to be connected. Please interact with
      the gamepad for it to be recognized. The "Trigger rumble!" button will be
      enabled after that.
    </p>
    <p>
      After pressing the "Trigger rumble!" button below, you should expect to
      feel a localized vibration in both triggers of all connected
      trigger-rumble compatible gamepads for one second.
    </p>
    <p>
      Please press the "Confirm effect has played" button to conclude
      the test.
    </p>
    <button id="play_trigger_rumble_button" disabled>No trigger-rumble gamepads detected</button>
    <button id="confirm_effect_button" disabled>Confirm effect has played</button>
    <script>
      async_test(t => {
        let connectedTriggerRumbleGamepads = {};
        playEffectButton = document.getElementById('play_trigger_rumble_button');

        function isTriggerRumbleSupported(gamepad) {
          return gamepad.vibrationActuator.effects.includes('trigger-rumble');
        }

        window.addEventListener('gamepadconnected', (e) => {
          if (!e.gamepad || !e.gamepad.vibrationActuator || !e.gamepad.vibrationActuator.effects) {
            return;
          }

          if (isTriggerRumbleSupported(e.gamepad)) {
            connectedTriggerRumbleGamepads[e.gamepad.index] = e.gamepad;

            if (playEffectButton.disabled) {
              playEffectButton.disabled = false;
              playEffectButton.innerText = 'Trigger rumble!'
            }
          }
        });

        window.addEventListener('gamepaddisconnected', (e) => {
          delete connectedTriggerRumbleGamepads[e.gamepad.index];

          let anyTriggerRumbleGamepad = false;
          for (let index in connectedTriggerRumbleGamepads){
            const gamepad = connectedTriggerRumbleGamepads[index];
            if (!gamepad || !gamepad.vibrationActuator || !gamepad.vibrationActuator.effects) {
              continue;
            }

            if (isTriggerRumbleSupported(gamepad)){
              anyTriggerRumbleGamepad = true;
              break;
            }
          }

          if (!anyTriggerRumbleGamepad && !playEffectButton.disabled) {
            playEffectButton.disabled = true;
            playEffectButton.innerText = "No trigger-rumble gamepads detected";
          }
        });

        playEffectButton.addEventListener("click", () => {
          let gamepads = navigator.getGamepads();
          for (const gamepad of gamepads) {
            if (gamepad && isTriggerRumbleSupported(gamepad)) {
              gamepad.vibrationActuator.playEffect("trigger-rumble", {
                duration: 1000,
                leftTrigger: 1.0,
                rightTrigger: 1.0,
              });
            }
          }

          const confirmButton = document.getElementById("confirm_effect_button");
          if (confirmButton.disabled) {
            confirmButton.disabled = false;
          }
          confirmButton.addEventListener('click', () => {
            t.done();
          });
        });
      }, "Gamepads with trigger-rumble capabilities should have the triggers' motors activated.");
    </script>
  </body>
</html>